Largest table has around 500. Rebuild or reindex ?? good question ! Analysis indexes defragmentation RATIO and decide to REORGANIZE OR REBUILD. We will call this stored procedure Maintenance. I made them up. 1. ALTER INDEX ALL ON [dbo]. If an index contains less than 100 pages, I will perform no maintenance. – The scripts has some cool features like. We are using clustered columnstore index in SqlServer 2016 for 400M rows. This caused the system to reorganize or rebuild. No right from SQL Server 7. Microsoft best practice says that you should generally not do a rebuild operation unless fragmentation is over 30%. Cancelling / Stopping ALTER INDEX REORGANIZE. The more the fragmentation you need to rebuild if its less you can reorganize. ALTER INDEX REORGANIZE statement is always performed online. SQL Server Database Engine. This makes it more likely that some other session is blocked by your session, and that you may, in turn, become blocked by a lock held by that session. The issue is resolved. Similarly, removing. First, let’s look at the index in this tutorial with sample code to create a non-clustered SQL Server index on a sales table. I wonder if there is just something weird about the way. In other words, zero percentage fragmentation:. Sc (Comp Sci). Without logic, the plan will. If you search for index rebuilding, you will find many complex scripts on the web, but this can also be done using SQL Server Maintenance Plans which we will discuss in this article. Index Reorganize/ Rebuild Time. Mar 8, 2021, 2:47 PM. Now that you learned how to create an index in SQL Server, it is time to undo it (only if you need to)! Learn how to drop an index in the next tutorial. On large tables, that may be a while and not frequent enough. The performance benefit may not be noticeable for indexes that are used primarily for seek operations. You can also change this threshold via parameters. avg_fragmentation_in_percent FROM sys. Ignore anything with less than 15-20 pages. This tip will explore two features to speed up SQL Server index and statistics maintenance. Hallengren website has an option to reorganize indexes say with 5% Fragmentation, and rebuild for 30% Fragmentation. Expand the Indexes folder. ALTER INDEX ALL ON table_name REBUILD OR. 3. An index reorganize holds an intent-exclusive table lock throughout the operation, which will only block shared, exclusive, and schema-modification table locks. Coming to update stats, I would prefer to do it with Full Scan depending on the size of the databases. It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. It is an on-disk structure that comprises of keys that point to one or more columns in the table or view. It is compatible with all versions of SQL Server 2005 , 2008 , 2012 , 2014 and 2016. 1 Answer. However, my SQL Server license is Standard and I can't rebuild indexes online. To solve this, I want to use the REORGANIZE operation every time. April 1, 2009 at 5:07 am. First, we will start with the "Maintenance Plan Wizard":The rebuild command will defragment all those intermediate pages. I still see questions about SQL Server 2000/2005 pop up on Stack Exchange. indexes. This is typically how indexes with page level locking disabled get created. This topic describes how to reorganize or rebuild a fragmented index in SQL Server 2017 by using SQL Server Management Studio or Transact-SQL. TEST REORGANIZE WITH. Feb 21, 2022, 8:01 AM. In SQL Server, the ALTER INDEX statement is used to modify an existing index. You can always update statistics on their own. You could also refer another query which may be helpful to you. I am not sure I am picturing this correctly. REORGANIZE, but shrink is going to take an age, and then you’ll generate a ton of log doing the fragmentation removal. So we can use index reorganize option to rebuild all the indexes. dm_db_index_physical_stats dm function. The size of one of the PK Clustered indexes is greater than 200GB, and for this one a REBUILD. That is not the last rebuild date of the index, it's the date the. Dec 19, 2021, 9:55 PM. dm_db_index_physical_stats (NULL, NULL, NULL, NULL, NULL); GO. Also trying to avoid logging to transaction log and log. ALTER INDEX REORGANIZE; however, log space is required. There is all reason to only rebuild index that are fragmented, and a good maintenance. From this tab, select a SQL Server instance in the server explorer on the left and choose database (s) as a target of index operation. Large object data is data with the image, text, ntext, varchar (max), nvarchar (max), varbinary (max), or xml data type. MS advises using Reorganize for 30% fragmentation or less. Therefore, it'll appear as if there is still fragmentation remaining, as the housing extent will contain pages from multiple indexes. March 2, 2023 at 3:05 pm. Note that the time it takes to complete the operations depends on the size of the database and how fragmented the indexes. I used this approach to improve performance and it worked perfectly for a long time. Click the plus sign to expand the table on which you want to rebuild an index online. Rebuild if > 30%. Use the ALTER TABLE command to rebuild the Heap. Depending on the type of index and database engine version, a rebuild operation can be done online or offline. 例えば、10 % 以上 30 % 未満であれば再構成 (Reorganize)、 30% 以上であれば再構築 (Rebuild) するとすれば、. These pages can get empty space on them and become out of order over time as well. ALTER FULLTEXT CATALOG [CatalogName] REBUILD. 1. Reorganize Index Log Generation Now here is the final demo of Reorganize the Index, it generates lots of Transaction Log records, a very simple demo, we will capture transaction log using sys. 8. We check the time for sample select query - it was 2s just after index creation. SQL Server 2005 Index Rebuild/Reorganize. ALTER DATABASEdb_name SETREAD_COMMITTED_SNAPSHOT ON go Alter index Index_name on table_name. Partitions can be rebuilt individually. _in_percent > 50 AND ss. . just like many things in RDBMS. For more information, see Data Types (Transact-SQL). And also, avg_fragmentation_in_percent value says percentage of logical fragmentation (This is. Clean Up History. REORGANIZE Tells SQL Server to perform a master merge, which involves merging the smaller indexes created in the process of indexing into one large index. If an index is between 10% and 30% fragmented, I will REORGANIZE the index and UPDATE the statistics. But commit your whole transaction before reorganize. Add a comment. As a good start, read these: Rebuild or Reorganize: SQL Server Index Maintenance (Kendra Little)“Reorganize” index option. I'd just add that adding the line PRINT @sql after the SET @sql =. is_ms_shipped = 0 --Excludes any objects created as a part of SQL Server installation AND ss. The. Rebuilding your indexes will slow queries down. " But following the Russ's reply the REORGANIZE is a more time expensive operation the REBUILD one. Larger indexes have more intermediate levels and pages. If you read complete article it was trying to point out the commands or operations in SQL Server which would require additional disk space and others that would not. For more information, see sys. The best practice recommendation is to reorganize your index if you have 5-30% of fragmentation, and only rebuild it if it has more than 30% fragmentation. Another option is to manually run sp_clean_db_free_space (to clean all database data files) or sp_clean_db_file_free_space (to clean a single database datafile), which will delete. Both create/rebuild of columnstore index is an OFFLINE operation at this time but you can defragment columnstore index ONLINE. Bulk amount records are deleted and updated frequently. Because of this, and also the fact that in such a small index that fragmentation is typically negligable, you really should only be rebuilding indexes with a certain page threshold. Applies to: SQL Server SSIS Integration Runtime in Azure Data Factory The Rebuild Index task rebuilds indexes in SQL Server database tables and views. Reorganize all indexes on the queue internal table. ” Select the vault database(s). dm_db_index_physical_stats DMV to identify the fragmentation. The REORGANIZE modifier for ALTER INDEX is not currently supported by Azure SQL. When you. Should be straight forward. The Page Fullness is 98. ALTER INDEX All ON tableName REBUILD; This drops the index and recreates it, removing fragementation, reclaims disk space and reorders index pages. It doesn’t work on the intermediate pages between the root and the leaf. When I run a maintenance plan to reorganize and rebuild tables indexes, it fails. Microsoft Certified Master: SQL Server, MVP, M. 6. I am a new DBA to a SQL 2005 production Report server. – Ed B. If not specified otherwise, the procedure uses the fill factor that is already set for each index. در این مقاله چگونگی reorganize و rebuild کردن ایندکس تکه تکه شده (Fragmented Index) در SQL Server 2014 با استفاده از محیط SSMS یا SQL Server Management Studio و T-SQL یا Transact-SQL شرح داده خواهد شد. To rebuild use: ALTER INDEX __NAME_OF_INDEX__ ON __NAME_OF_TABLE__ REBUILD. ALTER INDEX ALL ON Adventureworks. I am getting confused with choosing Index Reorganize/Rebuilding of indexes based on avg_fragmentation_in_percent returned by sys. index_id > 0 -- Indexes. Wouldn’t rebuilding an index with MAXDOP=4 on a heavily utilized SQL Server result in the index being (again) fragmented after the rebuild? This could happen in the case where they’re a lot of statements waiting to be processed and the database engine assingning the subtasks of the index reorganize in portions to different queues. You should intelligently do index reorg and rebuilds. However, you can use the following methods to rebuild your indexes: Method 1: Create a SQL Server agent job to rebuild indexes and update statistics. Our Production instance is running SQL Server 2014. Similarly, removing fragmentation in a. ALTER FULLTEXT INDEX ON [tblname] START FULL POPULATION. Expand the table on which you want to reorganize an index. SQL Server does not maintain when an Index was last rebuild, instead it keeps information when stats were last updated. The MAXDOP index option cannot be specified in the ALTER INDEX REORGANIZE statement. From Rebuild or Reorganize: SQL Server Index Maintenance by Kendra Little: Short version: Rebuild: An index ‘rebuild’ creates a fresh, sparkling new structure for the index. Update Statistics. dm_db_index_physical_stats dm function. Another possibly is that the index is being rebuilt and then re-fragmenting again. One solution is to deploy a faster I/O subsystem, where page splits would be less of an issue. e check fragmentation and take an appropriate action. Expand Tables. Jan 11 at 14:24. You could also refer another query which may be helpful to you. TheSQLGuru (10/19/2014) Most likely cause is simply that you are reorging wth too much fragmentation. SQL Server. between 5% and 30% logical fragmentation, reorganize it (using DBCC INDEXDEFRAG. Index maintenance such as index rebuilds are also a wasteful operation. To create SQL database maintenance plan, launch SQL Server Management Studio > expand the database instance > Management > right-click on the maintenance plan > New Maintenance Plan. Test all three and see which is fastest and which gives the least index fragmentation. We want to create an index. Edit 2: Nikita added a good point on moving the data to a different filegroup as an option to exporting it outside SQL Server. Dokumentasi SQL Server menggunakan istilah pohon B umumnya dalam referensi ke indeks. However, you can create a staging table insert all rows into that, drop original table and rename staging table to original. A SQL Server DBA myth a day: (29/30) fixing heap fragmentation. Let’s move on to creating the Reorganize Index task via the Maintenance Plans and then Update Statistics task. If the former, you could do a shrink and then ALTER INDEX. x) implemented major performance improvements for these index operations. Check indexes from the index grid and click desired defragment operation from the ribbon. DBCC DBREINDEX rebuilds an index for a table or all indexes defined for a table. The syntax for rebuilding indexes is very simple, we just add the "WITH ONLINE=ON" clause to the ALTER INDEX command. That can be found using the STATS_DATE function. Last night I killed the REORG on the clustered index after almost 6 hours of execution. Regards. You might ask why you should do this yourself, since this is what the tuple-mover. The Reorganize Index task also includes an option to compact large object data. This schema modification lock blocks all other concurrent access to the table, but it is only held for a very short period of time while the old index is dropped and the statistics updated. The first part of this tip focuses on SQL Server Enterprise Edition to reduce the duration for index maintenance for off-line rebuilds. Below the last two rows that displays the fail: Source: Reorganize Index Executing query "ALTER INDEX [PK_xxTableName] O. Reorganize all index in SQL Server. There are a number of differences. It drops index entirely and creates it from scratch. 2. For example, you can use ApexSQL Defrag to review the index usage statistics and apply the suitable. Stack Overflow. 3. When I run a maintenance plan to reorganize and rebuild tables indexes, it fails. Here are a couple of examples. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance When you perform online index operations, the following guidelines apply: Clustered indexes must be created, rebuilt, or dropped offline when the underlying table contains the following large object (LOB) data types: image, ntext, and text. REORGANZE index - is for reducing fragmentation without index rebuild, so no drop and create. Failing that (ie Standard Edition etc), look at re-organizing indexes - these will keep them online. Expand the Indexes. We should reorganize indexed with. Select Allow online DML processing, and then select True from the list. Total records at that time were 879 & after short time fragmentation went up to. . Do not use REORGANIZE. 2. SQL Server development version and Enterprise version has option ONLINE, which can be turned on. Okay, maybe not that. Is this possible to do? Creating a SQL Server Maintenance Plan. This means that an index can be rebuilt without knowing the structure of a table or its. The issue is that doing this manually is very tedious as we have 75+ tables, also I noticed the indexes seem to get fragmented very quickly. This blog entry I came across a while back will explain it much better than I can. You also can create a linked server to SQLAZURE and create a sql agent job. The following example returns all statistics for all tables and indexes within the instance of SQL Server by specifying the wildcard NULL for all parameters. Expand the Indexes folder. ALTER INDEX [name_of_the_index] ON [table_name] REORGANIZE; If you want to reorganize all the indexes on any table, you can run the following syntax. index_id > 0 -. Sumanta Roy (5/26/2011) Select Name as IndexName, STATS_DATE ( object_id , index_id ) as IndexCreatedDate. Reorganizing also compacts the index pages. Sc (Comp Sci). Index rebuilding process uses more CPU and it locks the database resources. The first steps of configuring the Reorganize Index task is quite similar to the Rebuild Index task. Thanks, I will try this next time. When a table has multiple indexes, create the clustered index first, then the nonclustered. The reason given is that the indexes and statistics are partly based on available CPU and memory resources. In my last tip, Index Fragmentation Report in SQL Server 2005 & 2008, I discussed what fragmentation is, its different types, its performance impact and what are different methods available in SQL Server 2005 and 2008 to identify fragmentation levels. Jonathan’s right in that fragmentation changes the query plan. record_count > 0 AND o. I would like to rebuild and reorganize my indexes, but our system works 24/7. On the SQL Server Maintenance Plan Wizard page, select Next. 3. To rebuild or reorganize indexes manually, head over to the Fragmentation tab. You can safely stop it but you need to find out why your database became slow. A clustered index exists, along with 3 non-clustered indexes. This is fixed in later service packs of SQL Server 2005 Management Studio. In this article. You cannot say, “If the index is 45% or more fragmented, rebuild it– otherwise do nothing. Again you most likely have some big indexes that are fragmented. To create a linked server to azure, you can see this SO link:I need to add a linked server to a MS Azure SQL ServerSelect “reorganize index” and “rebuild index. some action needs to be taken to remove the ghosted records. The scripts has some cool features like. If you want to know how far along it is, open up another instance of SSMS and connect to the server, then run a query against the sys. My predecessor created a Maintenance Plan with 4 tasks: CHECKDB; SHRINKDATABASE (N'DB1',10,TRUNCATEONLY); it seems to be running a REORGANIZE on all Indexes for all Tables and Views and "Compact Large Objects" is checked; and then it UPDATE. 35. Reorganize: Reorganize indexes with between 11-30 percent fragmentation. SQL Server NULL Index. indexes. This. The default value for this parameter will be ‘CATALOG’. every 2-3 day if running maintenance once per day (night). SORT_IN_TEMPDB means that SQL server will use tempdb to allocate the temporary space as opposed to allocating space in the user database whose index is being rebuild. @LeeWalters shrink is done, and yes, due to disk issues, not possible to add drives, that's why, in addition, db is populated with blob data, so the question is more from the index fragmentation side. For more information about this enhancement, check the SQL Server 2016. The simple reason which comes to my mind is rebuild should be done only when index is fragmented. So far, all good. •DatabaseBackup: SQL Server Backup •DatabaseIntegrityCheck: SQL Server Integrity Check •IndexOptimize: SQL Server Index and Statistics Maintenance. Msdn says: And also, avg_fragmentation_in_percent value says percentage of logical fragmentation (This is the percentage of out-of-order pages in the leaf pages of an index. Index rebuilds (not index reorganise) always do a fullscan update of the statistics. If this catalog has many indexes this rebuild could take a long time. First, we will start the index reorganization in a session using the following T-SQL code. ALTER INDEX ALL ON [dbo]. Otherwise you're holding an exclusive lock on the table/partition before you start the reorganize. Index rebuilding and reorganizing are the two methods to maintain indexes and improve database performance. As soon we rebuild index performance resume normal (high loaded system). It is used when the operation takes a. Product REBUILD GO Index Reorganize : This process physically reorganizes the leaf nodes of the index. the reorganize index also facing some problem like it is successfull once in three runs and twice it is failing. 3. The documentation is also indicating that: Online index operations are not available in every SQL Server edition. So now once you have identified the high fragmentation level in your database, which could. Drag and drop the index rebuild task from the maintenance plan toolbox. Therefore, focus on the larger indexes because their pages are less likely to be cached by SQL Server. This method can help when Change_tracking is Auto. The execute sql task should contain the index rebuild code along with stats rebuild . Both versions allow you to specify the. Here is MSDN article on this: Reorganizing and Rebuilding Indexes. Index Rebuild vs Index Reorganize. Yes -. If you select one database from the "Databases" dropdown list you then get the option to. Mohamad Mahmoud Darwish. Next the New Job window will open. Reorganize does not holds blocking locks. Index Defrag Script V4. Cancelling / Stopping ALTER INDEX REORGANIZE. It eventually makes a Job in your server agent and then you can set a schedule or run the job manually by running this script. Executing this query requires the VIEW SERVER STATE permission. Online index rebuild higher fragmentation on intermediate level. EXEC msdb. in this instance you can avoid re-inventing the wheel by making use of sql-server-index-and-statistics-maintenance – Stu. Once you select that option it will bring up the following screen. Rebuild/Reorganize working fine. My problem is that the reorg is running for a very long time. The entire index has to be read to rebuild it, so there's no reason to do a. So let’s take one thing at a time. Bug in Rebuild on SQL Server 2016 and above? 6. Backup Up Database (Full)4. The harder but much more. The database is using the Simple Recovery model. After it completes, we can see the job was successful. REORGANIZE, UPDATE STATISTICS and a simple SELECT statement. RDS for SQL Server doesn't have maintenance plans that automatically create plans and jobs to rebuild or reorganize indexes. LOB_COMPACTION Compacting large object (LOB) data can reduce the disk space used. ALTER INDEX All ON tableName REORGANIZE;The minimum permission to create/alter index can be easily found in corresponding BOL articles CREATE INDEX (Transact-SQL) and ALTER INDEX (Transact-SQL):. Create a new server connection to use when performing this task. In SQL Server Management Studio, in Object Explorer, expand the server. index_id = 0 -- Heap or table indexstats. The script uses the following parameters: @reportOnly (required) Values: - 0: The script will reorganize or rebuild the fragmented indexes. sysindexes compatibility view; therefore, preventing unnecessary updates of unchanged items. . Using above query, you could also query the progress of backup,restore,dbcc command and so on. dm_exec_requests showed the REORG was only 55%. The query processor uses statistics on your data to help determine how. Basically there’s no really easy AND resource-efficient way to do this, which is a problem with SQL Server. ALTER INDEX [PK_SalesOrderDetailEnlarged_SalesOrderID_SalesOrderDetailID] ON [Sales]. To fix the fragmentation either rebuild or reorganize the index on the table. Updating statistics is important for query processing and optimization. SQL Server 2016 (13. It is compatible with all versions of SQL Server 2005 , 2008 , 2012 , 2014 and 2016. Please refer to SQL Server Maintenance Plan Reorganize Index and Update Statistics Tasks to get more information about how to design the maintenance plan. As well as maintenance plans, SQL Server Agent jobs are also a handy way to automate and schedule index defragmentation jobs in SQL Server. The Microsoft Docs page for SQL Server statistics states: Operations such as rebuilding, defragmenting, or reorganizing an index do not change the distribution of data. The documentation for alter index, for example, shows that it accepts an index_name, not an expression that might evaluate to an index name. They are also configured from SSMS. . If you want to fully automate your SQL Server Index maintenance then I seriously recommend that you check out Michelle Ufford's stored procedure for this. If you what you are saying is true, even reorganizing the. If you search for index rebuilding, you will find many complex scripts on the web, but this can also be done. 7. DECLARE. @LeeWalters shrink is done, and yes, due to disk issues, not possible to add drives, that's why, in addition, db is populated with blob data, so the question is more from the index fragmentation side. 11. Thanks for your. Reorganize (SQL Server indexes, primary keys, and unique keys) The Reorganize Indexes dialog lets you reorganize an entire index, primary key, or unique key or a single partition of that object. [Product] SET ( ALLOW_PAGE_LOCKS = ON ) ALTER INDEX [PK_Product] ON [Production]. Disable the indexes on the target table (at least the non-clustered indexes, or NCIs) Insert the new data. . Reorganize Index Log Generation Now here is the final demo of Reorganize the Index, it generates lots of Transaction Log records, a very simple demo, we will capture transaction log using sys. These scripts are widely tested in the community and are much flexible so that you. Basically, an index rebuild copies the index to another place. Doing online operations not only reduces the need for the maintenance window, but they can be done more often throughout the week. When you double click on this task the following screen appears. 1. Microsoft's guidance on index reorganize and rebuild supports this: For example, if a given index is used mainly for scan operations, removing fragmentation can improve performance of these operations. Unlike REORGANIZE on user tables, REORGANIZE on a queue is always performed as an offline operation because page level locks are explicitly disabled on queues. Select the server connection to use when performing this task. If your indexes are fragmented : If index has less than 1000 pages - do not perform any index maintenance operation. Table locks alone would not make sense, the point with REORGANIZE is that the table is mainly online while the operation is running. Plan B is fine. ALTER INDEX ALL ON table_name REORGANIZE OR. Check the column, avg_fragmentation_in_percent and if its greater than. ALTER INDEX statement can be used to change the properties of an index, such as its fill factor or sort order, or to rebuild or reorganize the index. Hi, The widely used thresholds are: Reorganize if fragmentation is between 10-30%. By allowing an index to be rebuilt dynamically, indexes enforcing either PRIMARY KEY or UNIQUE constraints can be rebuilt without having to drop and re-create those constraints. Select the plus sign to expand the Management folder. WITH (ONLINE=ON). I'm able to rebuild all other indexes with online=on option and it won't affect performance. In this article. The index uses the main filters on the sales table from the time dimension, i. This index uses column-based data storage and query processing to achieve gains up to 10. dm_exec_requests to see how much longer your query has to finish. Reorganizing an index uses minimal system resources. Maybe I am reading a different article - but what you linked to is actually worse. Here is a sample script to reorganize any index in SQL Server. Large objects (LOBs) are stored in different "pages". Index Rebuild : This process drops the existing Index and Recreates the index. Therefore you do not need to update statistics OR reorganize an index if it gets rebuilt. Useful links. To reorganize index SQL Server, right-click it & choose Reorganize. The following example returns all statistics for all tables and indexes within the instance of SQL Server by specifying the wildcard NULL for all parameters. Next Steps This is a simple base script that could be modified into a stored procedure and also allow you to pass other parameters such as doing an index. In the previous SQL Server versions, using the Rebuild Index and Reorganize Index Maintenance Plans tasks to fix the database indexes fragmentation issue is not highly recommended. Ini tidak berlaku untuk indeks penyimpan kolom atau penyimpanan data dalam memori. Surly not, the Maintenance Plan was created in the current Server itself. From sys. 2. The index front is stable, no change. Regular index maintenance and statistics updates are crucial, that much is certain. As well as maintenance plans, SQL Server Agent jobs are also a handy way to automate and schedule index defragmentation jobs in SQL Server. If you're looking for whenif the index was ever rebuilt, the Ola sp does have the ability to log to a table and the previous DBA hopefully utilized this feature. By default, SQL Server uses a 100% fillfactor and tries to fill up all the pages in indexes as close to full as it can. For a more in-depth discussion of index rebuild and maintenance in SQL Server 2014 see SQL 2014 Clustered Columnstore index rebuild and maintenance considerations Consider the two trimmed row group scenarios below:AFAIK, In the Alter index statement if we use MAXdop option it is only specific for that index operation and not applicable whenever the index is used by a query. " But following the Russ's reply the REORGANIZE is a more time expensive operation the REBUILD one. By allowing an index to be rebuilt dynamically, indexes enforcing either PRIMARY KEY or UNIQUE constraints can be rebuilt without having to drop and re-create those constraints. NAME 'Index name', ips. Over here it will display all the indexes of the table and you can just click OK. index_type_desc,. First, we will start the index reorganization in a session using the following T-SQL code. He has the best practices coded into his scripts, so it should serve you well. The problem is that the size is getting out of control, I can see up to 99% fragmentation in the Primary Key clustered indexes. index rebuild/reorganize frequency. Rebuild Indexes. It's so bad on indexes that fragment that it's actually the cause of the myth of Random GUID Fragmentation. Here is the image for additional clarity. Applies to: SQL Server. You need to do more research but basically, reorganize as often as needed to keep your fragmentation under 20-30% until you can rebuild it during off-hours. That's why as a rule of thumb, for fragmentation greater than about 30%. The table at issue has 111,543,114 rows. Just a reminder that index reorganize is always online (all indexes are available during defrag) and index rebuild can be made also online (WITH. Reference to below article and discussion, rebuild only if page count >=1000If you want to try : I would like you to use READ_COMMITTED_SNAPSHOT isolation level for this operation and see if you succeed. [myTable] REORGANIZE WITH ( LOB_COMPACTION = ON ) I have the above query running for 16 days (still running), the table is a dummy table used for benchmark tests, it has over 10 Billion rows. This happens approx. This means that an index can be rebuilt without knowing the structure. Syntax ALTER INDEX index_name ON table_name. The first rebuilds a single index on a table and the second rebuilds all the indexes on the table. When reorganizing an index, SQL Server acquires an Intent-Exclusive lock on the index B-tree. Reorganizing also compacts the index pages. If you don't want to grant so granular. dm_db_index_physical_stats in a script to rebuild or reorganize indexes). December 8, 2009. So you should explicitly set a deadlock priority, and perhaps a retry loop, to enforce the behavior and document it.